Evolution Worksheet Template Page 3
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4____ 16 Which of these statements is TRUE of sponges?
A
They have no true tissues.
B
They are pseudocoelomates.
C
They have an open circulatory system.
D
Food is digested within a gastrovascular cavity.
____ 17 Which of these statements is TRUE of cnidarians?
A
They are segmented.
B
They have a nerve net.
C
They have an exoskeleton composed of chitin.
D
They have three tissue layers (they are triploblastic).
____ 18 Of the phyla on the phylum chart, the simplest (most primitive) one to have three tissue layers is the phylum
A
Cnidaria
B
Chordata
C
Arthropoda
D
Platyhelminthes
____ 19 Which of these statements is TRUE of nematodes?
A
They are segmented.
B
They lack a body cavity.
C
Their body plan has two main tissue layers.
D
They have a digestive system with two openings.
____ 20 Based on embryological evidence, echinoderms are most closely related to
A
rotifers.
B
annelids.
C
chordates.
D
arthropods.
____ 21 Earthworms are in the phylum
A
Annelida.
B
Nematoda.
C
Arthropoda.
D
Platyhelminthes.
____ 22 Which of these statements is TRUE of earthworms?
A
They have a body cavity.
B
They lack an excretory system.
C
They have a bony endoskeleton.
D
Their body plan consists of two tissue layers.
____23 Zebra snails are classified in the phylum
A
Cnidaria.
B
Mollusca.
C
Arthropoda.
D
Echinodermata.
____ 24 Which of these characteristics is common to both snails and earthworms?
A
segmentation
B
an exoskeleton
C
a closed circulatory system
D
an digestive system with two openings
____ 25 Grasshoppers exchange gases with the environment via
A
nephridia.
B
book lungs.
C
Malpighian tubules.
D
spiracles and tracheae.
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